me and my mom are going to go to TSC thursday and getting 4 RIR pullets (we didn't order RIR's and mom REALLY wants them) and 2 Ducks (my first ever!), and we have 10 chicks in the brooder in our basement right now that will be 4 weeks old on Friday and since they're different ages i will have to put another lamp in there for the new chickies. 1. Would i would have to seperate them with a divider? 2. Would the older ones pick on the new ones? 3. Once little ones are big enough to join the big ones in the coop would the big ones pick on them or not??? !!!Thanks in advance!!! !Shkittles!